Python's ExitStack allows you to programmatically enter and leave context managers. Powerful, but it's enough rope to hang yourself.
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Underrated perk of JSON: it's easy to programmatically make changes to a file made by a human.
Very few other formats have this advantage. `cargo add` took a bunch more implementation work than `npm install`, because preserving TOML comments takes more work.
I occasionally see people debate whether important functions should occur first, or helper functions first.
I've not seen it enforced though. It's hard to programmatically enforce.
OCaml takes a side: you have to put helper functions first!
Programmatically generating chess puzzles from a database of games played by users: